EP3184390A1 - Hybrid electric vehicle - Google Patents

Hybrid electric vehicle Download PDF

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Publication number
EP3184390A1
EP3184390A1 EP16206253.3A EP16206253A EP3184390A1 EP 3184390 A1 EP3184390 A1 EP 3184390A1 EP 16206253 A EP16206253 A EP 16206253A EP 3184390 A1 EP3184390 A1 EP 3184390A1
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EP
European Patent Office
Prior art keywords
driving
electric vehicle
hybrid electric
gradient
combustion engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16206253.3A
Other languages
German (de)
English (en)
French (fr)
Inventor
Junpei Hatsuda
Shigeki Kazehare
Masashi Eto
Takanori Kon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Publication of EP3184390A1 publication Critical patent/EP3184390A1/en
Withdrawn legal-status Critical Current

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    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/28—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the electric energy storing means, e.g. batteries or capacitors
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    • Y10S903/00—Hybrid electric vehicles, HEVS
    • Y10S903/902—Prime movers comprising electrical and internal combustion motors
    • Y10S903/903—Prime movers comprising electrical and internal combustion motors having energy storing means, e.g. battery, capacitor
    • Y10S903/904—Component specially adapted for hev
    • Y10S903/912—Drive line clutch
    • Y10S903/914—Actuated, e.g. engaged or disengaged by electrical, hydraulic or mechanical means

Definitions

  • the present invention relates to a hybrid electric vehicle.
  • a regeneration control apparatus activates a motor to operate as a generator when the hybrid electric vehicle which uses an engine and the motor as power sources is decelerated to charge a motor driving battery based on regeneration energy which is determined according to the degree of deceleration, and this regeneration control apparatus corrects the regeneration energy which is charged from the motor to the battery according to the gradient of a road surface of a downward slope when the hybrid electric vehicle climbs down on the slope.
  • JP-A-2000-102110 it is possible to suppress the occurrence of a situation where the battery is charged so full that regenerative braking is prevented from being performed while the hybrid electric vehicle is climbing down on the downward slope where there are many opportunities of decelerating regeneration.
  • the battery is charged full inevitably even though the correction is made to reduce the regeneration energy depending upon the state of charge of the battery and the distance and gradient of the downward slope on which the hybrid electric vehicle climbs down. As this occurs, it is not possible to obtain the stable feeling of deceleration.
  • An object of the invention is to provide a hybrid electric vehicle which can provide a feeling of deceleration through hearing and a stable feeling of deceleration while the hybrid electric vehicle is climbing down on a downward slope.
  • a hybrid electric vehicle including:
  • a hybrid electric vehicle including:
  • the control portion switches from the first driving to the second driving when the control portion obtains a request for a switch to the second driving while the hybrid electric vehicle runs a downward slope on the first driving.
  • the control portion restricts a switch from the second driving to the first driving when the gradient of the downward slope which is obtained by the gradient acquiring portion is equal to or greater than a threshold value, and the control portion holds the second driving when the switch from the second driving to the first driving is restricted, even though the control portion obtains a request for a switch to the first driving while the hybrid electric vehicle runs the downward slope on the second driving.
  • control portion determines on the first driving irrespective of a gradient of the downward slope which is obtained by the gradient acquiring portion when a driving speed of the hybrid electric vehicle is less than a threshold value.
  • control portion controls the motor to regenerate while the hybrid electric vehicle runs the downward slope on the first driving or on the second driving.
  • the exhaust sound of the internal combustion engine can be obtained in the event that the hybrid electric vehicle is caused to run on the second driving based on the gradient of the downward slope where the hybrid electric vehicle runs. Since the driver of the hybrid electric vehicle can obtain or sense a feeling of deceleration through hearing from this exhaust sound, the driver can be given a feeling of sporty drive.
  • the hybrid electric vehicle is caused to hold the second driving even though the control portion obtains the request for a switch to the first driving while the hybrid electric vehicle runs the downward slope on the second driving. Since the internal combustion engine provides the braking force while the hybrid electric vehicle which is running on the second driving is decelerated, the exhaust sound of the internal combustion engine is obtained when the hybrid electric vehicle runs the downward slope on the second driving. Since the driver of the hybrid electric vehicle can obtain or sense a feeling of deceleration through hearing from this exhaust sound, the driver can be given a feeling of sporty drive.
  • the hybrid electric vehicle when a request for a switch to the second driving is made while the hybrid electric vehicle runs the downward slope on the first driving, the driving of the hybrid electric vehicle is switched to the second driving.
  • the hybrid electric vehicle can be driven according to the intention of the driver irrespective of the gradient of the downward slope, and not only a feeling of deceleration through hearing but also a stable feeling of deceleration can be provided.
  • the hybrid electric vehicle by restricting the switch from the second driving to the first driving when the gradient is equal to or greater than the threshold value, the hybrid electric vehicle is caused to hold the second driving even though the control portion obtains the request for a switch to the first driving while the hybrid electric vehicle runs the downward slope on the second driving.
  • a phenomenon in which the exhaust sound of the internal combustion engine is lost or the feeling of deceleration fluctuates is generated when the driving of the hybrid electric vehicle is switched to the first driving, since such a phenomenon is prevented from occurrence in case the hybrid electric vehicle is caused to hold the second driving, the driver of the hybrid electric vehicle is prevented from feeling a sensation of physical disorder.
  • the hybrid electric vehicle runs the downward slope on the first driving when the driving speed is less than the threshold value, it is possible to prevent the provision of a feeling of excessive deceleration by means of the braking force of the internal combustion engine or the deterioration of drivability.
  • HEV Hybrid Electric Vehicle
  • Fig. 1 is a block diagram showing an internal configuration of a hybrid electric vehicle.
  • a hybrid electric vehicle (hereinafter, referred to simply as a "vehicle") shown in Fig. 1 includes an internal combustion engine ENG, a motor-generator MG, a battery BAT, a VCU (Voltage Control Unit) 101, an inverter INV, clutches CL1, CL2, a vehicle speed sensor 103, an inclination sensor 105 and a management ECU (Electric Control Unit) 107 and is configured to be driven by means of power of the internal combustion engine ENG and/or the motor-generator MG according to a running state of the vehicle.
  • thick solid lines denote mechanical connections
  • double chain double-dashed lines denote electric power wirings
  • thin solid lines denote control signals or detection signals.
  • the internal combustion engine ENG outputs a driving force for driving the vehicle. Torque generated in the internal combustion engine ENG is transmitted to driving wheels W by way of the clutches CL1, CL2, the motor-generator MG, a gearbox GB including speed gears and a speed reducer D. The motor-generator MG outputs a driving force for driving the vehicle. Torque generated in the motor-generator MG is transmitted to the driving wheels W by way of the clutch CL1, the gearbox GB and the speed reducer D. Additionally, the motor-generator MG can function as a generator (performing a regenerative operation) when the vehicle is slowed down through application of brakes.
  • the battery BAT has a plurality of battery cells which are connected in series or parallel and supplies a high voltage in the range of 100 to 200V, for example.
  • the battery cells are, for example, lithium ion battery cells or nickel-metal hydride battery cells.
  • the VCU 101 increases the direct-current output voltage of the battery BAT as it is.
  • the VCU 101 decreases the voltage of direct-current electric power which is generated by the motor-generator MG when the motor-generator MG performs a regenerative operation and is then converted into direct current.
  • the electric power whose voltage is decreased by the VCU 101 is stored in the battery BAT.
  • the inverter INV converts direct current voltage into alternating current voltage and supplies three-phase current to the motor-generator MG.
  • the inverter INV converts an alternating current voltage which is generated by the motor-generator MG when the motor-generator MG performs a regenerative operation into a direct current voltage.
  • the clutch CL1 is engaged or disengaged to connect or disconnect a power transmission path between the gearbox GB and the motor-generator MG in response to an instruction from the management ECU 107.
  • the clutch CL2 is engaged or disengaged to connect or disconnect a power transmission path between the motor-generator MG and the internal combustion engine ENG in response to an instruction from the management ECU 107.
  • the vehicle speed sensor 103 detects a driving speed (a vehicle speed VP) of the vehicle. A signal that indicates the vehicle speed VP detected by the vehicle speed sensor 103 is sent to the management ECU 107.
  • the inclination sensor 105 detects a gradient of a road surface on which the vehicle is being driven. A signal signaling the gradient (the inclination angle) G of the road surface detected by the inclination sensor 105 is sent to the management ECU 107.
  • the management ECU 107 controls, as will be described later, the selection of driving modes of the vehicle, the driving of the internal combustion engine ENG, and the driving of the motor-generator MG through controls by the VCU 101 and the inverter INV.
  • the management ECU 107 receives various signals including a signal signaling an accelerator pedal position (an AP position) which corresponds to an accelerator pedal operation by the driver of the vehicle, a signal signaling brake pedal effort (BRK effort) which corresponds to a brake pedal operation by the driver of the vehicle, a signal signaling a vehicle speed VP which is sent from the vehicle speed sensor 103, and a signal signaling a gradient G of a road surface which is sent from the inclination sensor 105.
  • the management ECU 107 determines respective powers which the internal combustion engine ENG and the motor-generator MG output based on the AP position and the vehicle speed VP which the management ECU 107 receives.
  • the vehicle of this embodiment is driven on anyone of an "EV driving mode,” an “assisted driving mode,” and an “overdrive (OD) driving mode,” and the drive source including the internal combustion engine ENG and the motor-generator MG is used differently in these driving modes.
  • the vehicle When the vehicle is accelerated on the EV driving mode, the vehicle is driven by means of the power from the motor-generator MG, during which the internal combustion engine ENG is not driven.
  • the vehicle When the vehicle is decelerated on the EV driving mode, electric power which is obtained as a result of a regenerative operation of the motor-generator MG is stored in the battery BAT.
  • the management ECU 107 applies or engages the clutch CL1 and releases or disengages the clutch CL2.
  • the vehicle When the vehicle is accelerated on the assisted driving mode, the vehicle is driven by means of power into which the power from the internal combustion engine ENG and the power from the motor-generator MG are combined.
  • the vehicle When the vehicle is decelerated on the assisted driving mode, electric power obtained a result of a regenerative operation by the motor-generator MG is stored in the battery BAT, and the internal combustion engine ENG provides a braking force.
  • the vehicle When the vehicle is accelerated on the OD driving mode, the vehicle is driven by means of the power from the internal combustion engine ENG, and as this occurs, although a field weakening control is performed on the motor-generator MG so as to enhance the energy efficiency, the motor-generator MG is not driven to output power to drive the vehicle.
  • the internal combustion engine ENG provides a braking force.
  • the motor-generator MG may perform a regenerative operation even when the vehicle is decelerated on the OD driving mode. As this occurs, the motor-generator MG generates, for example, electric power which the accessories of the hybrid electric vehicle require.
  • the assisted driving mode and the OD driving mode will be taken as one driving mode which will be referred to as an "ENG driving mode.”
  • the management ECU 107 engages both the clutch CL1 and the clutch CL2.
  • the gradient G in the following description denotes the gradient of the downward slope.
  • Fig. 2 is a flowchart showing a flow of operations performed by the management ECU 107 in controlling the selection of the driving modes.
  • the management ECU 107 determines whether or not the vehicle speed VP obtained from the vehicle speed sensor 103 is equal to or greater than a threshold value thv (step S101). If it is determined that the vehicle speed is equal to or greater than the threshold value thv, the flow proceeds to step S103, whereas if it is determined that the vehicle speed VP is smaller than the threshold value thv, the flow proceeds to step S107.
  • step S103 the management ECU 107 determines whether or not the gradient G obtained from the inclination sensor 105 is equal to or greater than a threshold value thg. If it is determined that the gradient G is equal to or greater than the threshold value thg, the flow proceeds to step S105, whereas if it is determined that the gradient G is smaller than the threshold value thg, the flow proceeds to step S107.
  • step S105 the management ECU 107 sets a restriction which restricts a switch from the ENG driving mode to the EV driving mode. Namely, once the management ECU 107 sets the restriction, the management ECU 107 restricts a switch to the EV driving mode while the vehicle is driven on the ENG driving mode.
  • step S107 the management ECU 107 determines whether the driving mode of the vehicle is the ENG driving mode or the EV driving mode. If it is determined that the vehicle is being driven on the ENG driving mode, the flow proceeds to step S109, whereas if it is determined that the vehicle is being driven on the EV driving mode, the flow proceeds to step S 115.
  • step S109 the management ECU 107 determines whether or not a request for a switch to the EV driving mode has been made based on a judgment which gives importance to the energy efficiency. If it is determined that the request for a switch to the EV driving mode has been made, the flow proceeds to step S111, whereas if it is determined that the request has not been made, the flow proceeds to step S113.
  • step S111 the management ECU 107 determines whether or not the restriction on the switch from the ENG driving mode to the EV driving mode has been set. If it is determined that the restriction has been set, the flow proceeds to step S113, whereas if it is determined that the restriction has not been set, the flow proceeds to step S 117. In step S 113, the management ECU 107 selects the ENG driving mode as the driving mode of the vehicle.
  • step S115 the management ECU 107 determines whether or not a request for a switch to the ENG driving mode has been made based on a judgment which gives importance to the energy efficiency and the driver's request. If it is determined that the request for a switch to the ENG driving mode has been made, the flow proceeds to step S113, whereas if it is determined that the request has not been made, the flow proceeds to step S 117. In step S 117, the management ECU 107 selects the EV driving mode as the driving mode of the vehicle.
  • Fig. 3 is a timing chart showing an example of a change with time in the driving mode and various parameters when the vehicle which has been driven on the ENG driving mode on a flat road climbs down a downward slope.
  • Fig. 4 is a timing chart showing an example of a change with time in the driving mode and the various parameters when the vehicle which has been driven on the EV driving mode on the flat road climbs down the downward slope.
  • FIG. 5 is a timing chart showing a change with time in the driving mode and the various parameters when the vehicle which has climbed down a downward slope on the ENG driving mode is driven on a flat road.
  • the vehicle is driven at a vehicle speed VP which is equal to or faster than the threshold value thv.
  • the management ECU 107 sets a flag which permits the Prosmatec control and a flag (an EV switch restricting flag) which restricts the switch from the ENG driving mode to the EV driving mode at a point in time (t11) when the gradient G of the downward slope on which the vehicle which has been driven on the ENG driving mode on the flat road climbs down becomes equal to or greater than the threshold value thg.
  • the management ECU 107 holds the driving mode of the vehicle to the ENG driving mode even though a request for a switch to the EV driving mode is made based on the judgment which gives importance to the energy efficiency in case the EV switch restricting flag is set.
  • the management ECU 107 sets the flag which permits the Prosmatec control and the flag (the EV switch restricting flag) which restricts the switch from the ENG driving mode to the EV driving mode at a point in time (t21) when the gradient G of the downward slope on which the vehicle which has been driven on the EV driving mode on the flat road climbs down becomes equal to or greater than the threshold value thg.
  • the management ECU 107 switches the driving mode of the vehicle to the ENG driving mode in the event that a request for a switch to the ENG driving mode is made based on the judgment which gives importance to the energy efficiency in case the EV switch restricting flag is set. Thereafter, with the EV switch restricting flag set, the management ECU 107 holds the driving mode of the vehicle to the ENG driving mode even though a request for a switch to the EV driving mode is made based on the judgment which gives importance to the energy efficiency.
  • the management ECU 107 sets down not only the flag which permits the Prosmatec control at a point in time (t31) but also the flag (the EV switch restricting flag) which restricts the switch from the ENG driving mode to the EV driving mode when a gradient G of a portion of the downward slope on which the vehicle which has climbed down the downward slope on the ENG driving mode is now climbing down just before the vehicle reaches a flat road becomes smaller than the threshold value thg.
  • the management ECU 107 switches the driving mode of the vehicle to the EV driving mode.
  • the switch from the ENG driving mode to the EV driving mode is restricted, whereby even though a request for a switch to the EV driving mode is made while the vehicle is climbing down the downward slope, the driving mode of the hybrid electric vehicle is held to the ENG driving mode.
  • the internal combustion engine ENG provides the braking force when the hybrid electric vehicle which is driven on the ENG driving mode is decelerated, the exhaust sound of the internal combustion engine is obtained when the hybrid electric vehicle climbs down the downward slope on the ENG driving mode. Since the driver of the hybrid electric vehicle can obtain or sense a feeling of deceleration through hearing from this exhaust sound, the driver can be given a feeling of sporty drive.
  • the driving mode of the hybrid electric vehicle is switched to the ENG driving mode.
  • the request for a switch to the ENG driving mode is based on the operation of the driver of the hybrid electric vehicle, not only the driving according to the intention of the driver is enabled irrespective of the gradient of the downward slope, but also the stable feeling of deceleration together with the feeling of deceleration through hearing can be provided.
  • the driver of the hybrid electric vehicle can be prevented from sensing a feeling of excessive deceleration or encountering the deterioration in drivability both of which could be caused by the braking force of the internal combustion engine ENG when the hybrid electric vehicle is driven at low speeds on the ENG driving.
  • the motor-generator MG performs a regenerative operation to generate electric power required by the accessories of the hybrid electric vehicle when the hybrid electric vehicle climbs down the downward slope, the reduction in SOC (State of Charge) of the battery BAT which supplies electric power to the accessories can be prevented.
  • the hybrid electric vehicle described above is the parallel HEV
  • the hybrid electric vehicle may be an HEV which can be switched between the series system and the parallel system as shown in Figs. 6 , 7 , a two-motor electric four-wheel drive HEV shown in Fig. 8 , a single motor electric four-wheel drive HEV shown in Fig. 9 , a three-motor electric four-wheel drive HEV shown in Fig. 10 or a two-motor electric four-wheel HEV shown in Fig. 11 .

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Automation & Control Theory (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
EP16206253.3A 2015-12-25 2016-12-22 Hybrid electric vehicle Withdrawn EP3184390A1 (en)

Applications Claiming Priority (1)

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JP2015253973A JP6326403B2 (ja) 2015-12-25 2015-12-25 ハイブリッド車両

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US20170182998A1 (en) 2017-06-29
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